[FFmpeg-cvslog] libavcodec/jpeg2000dec.c: Support for CRG marker

Gautam Ramakrishnan git at videolan.org
Thu Apr 23 01:07:48 EEST 2020


ffmpeg | branch: master | Gautam Ramakrishnan <gautamramk at gmail.com> | Thu Apr 23 00:22:39 2020 +0530| [6bd4a261689b2f464fba5d94f9c185c333ac947a] | committer: Michael Niedermayer

libavcodec/jpeg2000dec.c: Support for CRG marker

This patch adds support to skip the CRG marker.
The CRG marker, is an informational marker.
Allows samples such as p0_03.j2k to be decoded.

Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=6bd4a261689b2f464fba5d94f9c185c333ac947a
---

 libavcodec/jpeg2000dec.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/libavcodec/jpeg2000dec.c b/libavcodec/jpeg2000dec.c
index af6dcee228..5a7d9e7882 100644
--- a/libavcodec/jpeg2000dec.c
+++ b/libavcodec/jpeg2000dec.c
@@ -798,6 +798,15 @@ static int get_sot(Jpeg2000DecoderContext *s, int n)
     return 0;
 }
 
+static int read_crg(Jpeg2000DecoderContext *s, int n)
+{
+    if (s->ncomponents*4 != n - 2) {
+        av_log(s->avctx, AV_LOG_ERROR, "Invalid CRG marker.\n");
+        return AVERROR_INVALIDDATA;
+    }
+    bytestream2_skip(&s->g, n - 2);
+    return 0;
+}
 /* Tile-part lengths: see ISO 15444-1:2002, section A.7.1
  * Used to know the number of tile parts and lengths.
  * There may be multiple TLMs in the header.
@@ -2061,6 +2070,9 @@ static int jpeg2000_read_main_headers(Jpeg2000DecoderContext *s)
             // the comment is ignored
             bytestream2_skip(&s->g, len - 2);
             break;
+        case JPEG2000_CRG:
+            ret = read_crg(s, len);
+            break;
         case JPEG2000_TLM:
             // Tile-part lengths
             ret = get_tlm(s, len);



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